US20200080509A1 - Weight-Optimized Steel Piston - Google Patents

Weight-Optimized Steel Piston Download PDF

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Publication number
US20200080509A1
US20200080509A1 US16/466,771 US201716466771A US2020080509A1 US 20200080509 A1 US20200080509 A1 US 20200080509A1 US 201716466771 A US201716466771 A US 201716466771A US 2020080509 A1 US2020080509 A1 US 2020080509A1
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US
United States
Prior art keywords
piston
rib
load
wall sections
bearing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US16/466,771
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English (en)
Inventor
Albert Haberl
Thorsten Thomassen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KS Kolbenschmidt GmbH
Original Assignee
KS Kolbenschmidt GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by KS Kolbenschmidt GmbH filed Critical KS Kolbenschmidt GmbH
Publication of US20200080509A1 publication Critical patent/US20200080509A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/0076—Pistons  the inside of the pistons being provided with ribs or fins
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J1/00—Pistons; Trunk pistons; Plungers
    • F16J1/005—Pistons; Trunk pistons; Plungers obtained by assembling several pieces

Definitions

  • the invention relates to a piston of an internal combustion engine.
  • the piston includes an upper part with piston bosses appended thereon and with load-bearing skirt wall sections.
  • Pistons for internal combustion engines have either a cylindrical, fully circumferential piston skirt, which is arranged (appended) beneath an upper part of the piston, or pistons exist in the so-called box design, wherein such pistons have load-bearing skirt wall sections, so that the piston skirt thereof is only partially present and is not configured so as to be fully cylindrical.
  • the load-bearing skirt wall sections are connected, via connecting walls which extend in the direction of the piston bosses.
  • the connecting walls extend, proceeding from each pin boss, in the direction of the lateral regions of the load-bearing skirt wall sections.
  • the invention is therefore based on the problem of providing a piston of an internal combustion engine with which the disadvantages which were described in the introduction are avoided and which is further optimized with regard to its weight, in particular with regard to a weight reduction.
  • the load-bearing skirt wall sections are arranged in a self-supporting manner on the upper part without a connection to the piston bosses, and that proceeding from the underside of the upper part a rib runs in the direction of the inner side of the load-bearing skirt wall sections.
  • the known connecting walls, which are present between the pin bosses and the lateral edges of the load-bearing skirt wall sections are therefore replaced by only one rib, which presents a connection between the upper part of the piston, in particular the underside of the upper part, and the inner side of the load-bearing skirt wall sections.
  • the configuration of the rib in particular its course, its shape and its thickness is to be selected depending on the supporting of the load-bearing skirt wall sections and therefore so that for the respective purpose of use of the piston in the internal combustion engine, on the one hand, the necessary supporting of the load-bearing skirt wall sections takes place and, on the other hand, the necessary resilience of the load-bearing skirt wall sections is provided during the movement of the piston in the cylinder of the internal combustion engine.
  • the piston according to the invention can be produced according to the conventional known production methods, for example in a casting method, wherein however forging methods are also conceivable.
  • the piston is produced in one piece with the load-bearing skirt wall sections arranged in a self-supporting manner on the upper part, with the pin bosses and with the upper part according to one of the mentioned methods. It is also conceivable to produce the individual elements (such as skirt wall sections, pin bosses, upper part and suchlike) as individual parts and to connect these to one another non-detachably by a joining method.
  • the course of the rib is basically variable in height in a manner adapted to the load requirements, preferably running maximally up to the lower piston end.
  • the rib runs up to the lower edge of the load-bearing skirt wall sections. Whilst it is basically conceivable not to direct the rib up to the lower edge and to allow it to run out in the course of the rising skirt wall sections (in relation to the piston stroke axis), the course of the rib up to the lower edge of the skirt wall sections is particularly advantageous, in order to realize the necessary arrangement and supporting of the load-bearing skirt wall sections on the upper part of the piston.
  • the rib runs centrally in the inner region of the piston. This means that the rib runs through the piston stroke axis. This has the advantage that thereby the piston can be configured mirror-symmetrically and thereby the applied method of production can be simplified.
  • the load-bearing skirt wall sections are configured in a fully self-supporting manner and are connected only via the rib on the upper part. Whilst it is basically conceivable that the load-bearing skirt wall sections are arranged and connected directly on the underside of the upper part, it is also conceivable to configure the load-bearing skirt wall sections in a fully self-supporting manner and to connect them only via the rib on the upper part, in particular its underside. Such an embodiment presents itself when the upper part with its appended pin bosses, and if applicable also the rib, are produced in one piece in a suitable method and the load-bearing skirt wall sections are realized separately therefrom.
  • the load-bearing skirt wall sections are joined as individual parts on the rib without connection, in particular without joining connection, onto the underside of the upper part only on the rib.
  • the weight of the piston can be further reduced, because the area of the load-bearing skirt wall sections must be configured to be only as large as is necessary for the supporting of the piston in the cylinder of the internal combustion engine.
  • the load-bearing skirt wall sections have an indentation.
  • the weight of the piston can likewise be reduced, without the area which is necessary for the supporting of the piston in the cylinder of the internal combustion engine being reduced in a disadvantageous manner.
  • the indentation runs parallel to the piston stroke axis, wherein, however, other orientations are also conceivable.
  • FIG. 1 is a bottom perspective view of one example of the piston invention.
  • FIG. 2 is a top perspective view of the piston in FIG. 1 .
  • FIG. 3 is a cross-sectional view taken along line 3 - 3 in FIG. 2 .
  • FIG. 4 is a cross-sectional view taken along line 44 in FIG. 2 .
  • FIG. 5 is a bottom perspective view of an alternate example of the piston invention.
  • FIG. 5A is a cross-sectional view taken along line 5 - 5 in FIG. 5 .
  • FIG. 6 is a top perspective view of an alternate example of the piston invention.
  • FIG. 6A is a cross-sectional view taken along line 6 - 6 in FIG. 6
  • FIG. 7 is a cross-sectional view taken along line 7 - 7 in FIG. 6
  • FIG. 8 is a top perspective view of an alternate example of the piston invention.
  • FIG. 9 is a cross-sectional view taken along line 9 - 9 in FIG. 8 .
  • FIG. 10 is a cross-sectional view taken along line 10 - 10 in FIG. 8 .
  • FIGS. 1 to 4 a first example embodiment of a piston 1 of an internal combustion engine is shown.
  • the piston 1 has an upper part 2 with piston bosses 3 appended thereon, in which piston bosses respectively a pin bore 4 is situated, and load-bearing skirt wall sections 5 .
  • the load-bearing skirt wall sections 5 are arranged on three sides in a self-supporting manner on the upper part 2 , wherein the fourth side has a direct connection (in one piece or joined on) to the upper part 2 , in particular its underside.
  • the load-bearing skirt wall sections 5 are supported by a rib 6 running in the direction of the inner side of the load-bearing skirt wall sections 5 proceeding from the underside of the upper part 2 . This rib 6 is configured centrally symmetrically and runs through the piston stroke axis.
  • the piston 1 shown in FIGS. 1 to 4 can have a cooling duct 7 , as well as a combustion bowl 8 , but it does not have to.
  • a cooling duct 7 When a cooling duct 7 is present, the latter is closed on its underside in a manner known per se, and has an inlet opening and an outlet opening, in order to introduce a cooling medium into the cooling duct 7 , to circulate it there and to discharge it again from the cooling duct 7 .
  • the cooling duct 7 is interrupted by the rib 6 , it is conceivable that two cooling duct parts, in particular cooling duct halves, are configured, or that a transfer opening is provided in the rib 6 .
  • the cooling duct 7 illustrated in particular in FIG. 3 does not necessarily have to serve as a cooling duct, but can also simply be present as a free space for the further weight reduction in the upper part 2 .
  • FIGS. 5 to 7 show similar examples of the embodiment of a piston 1 , wherein the same elements are given the same reference numbers in these figures as already in FIGS. 1 to 4 .
  • the load-bearing skirt wall sections 5 A have an indentation 9 .
  • This indentation 9 runs parallel to the piston stroke axis, but can also have a different orientation.
  • the load-bearing skirt wall sections 5 , 5 A are arranged with three sides in a self-supporting manner on the upper part 2 via the fourth side
  • the load-bearing skirt wall sections 5 B are arranged in a fully self-supporting manner only via the rib 6 on the underside of the upper part 2 .
  • the load-bearing skirt wall sections 5 B have four free sides and are only connected via their inner side and the course of the rib 6 with the upper part 2 , in particular on its underside.
  • This configuration presents itself in particular when not only is the weight of the piston 1 to be further reduced, but also for example the upper part 2 and the rib 6 are produced in one piece in a suitable method and the load-bearing skirt wall sections 5 B are produced as separate components therefrom and subsequently the load-bearing skirt wall sections 5 B are to be arranged and fastened in a non-detachable manner via a suitable method (such as e.g. welding, soldering, gluing or suchlike) on the rib 6 .
  • a suitable method such as e.g. welding, soldering, gluing or suchlike

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
US16/466,771 2016-12-06 2017-12-06 Weight-Optimized Steel Piston Abandoned US20200080509A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102016123573.3 2016-12-06
DE102016123573 2016-12-06
PCT/EP2017/081725 WO2018104399A1 (fr) 2016-12-06 2017-12-06 Piston en acier à poids optimisé

Publications (1)

Publication Number Publication Date
US20200080509A1 true US20200080509A1 (en) 2020-03-12

Family

ID=60702682

Family Applications (1)

Application Number Title Priority Date Filing Date
US16/466,771 Abandoned US20200080509A1 (en) 2016-12-06 2017-12-06 Weight-Optimized Steel Piston

Country Status (6)

Country Link
US (1) US20200080509A1 (fr)
EP (1) EP3551869A1 (fr)
CN (1) CN110114570A (fr)
DE (1) DE102017129037A1 (fr)
MX (1) MX2019006061A (fr)
WO (1) WO2018104399A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10968862B2 (en) * 2013-11-07 2021-04-06 Tenneco Inc. Monolithic, galleryless piston and method of construction thereof

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1568547A (en) * 1924-12-13 1926-01-05 William R Day Piston
US3173345A (en) * 1963-02-12 1965-03-16 Thompson Marion Lee Piston
US7415961B1 (en) * 2007-02-01 2008-08-26 Marina Ling Chen Piston for internal combustion engine, compressor or the like
US20090188464A1 (en) * 2008-01-29 2009-07-30 Brp-Rotax Gmbh & Co. Kg Piston for an internal combustion engine

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB442914A (en) * 1934-11-10 1936-02-18 Martin Valentine Roberts Improvements in pistons
JPS6447958U (fr) * 1987-09-21 1989-03-24
DE10145589B4 (de) 2001-09-15 2006-09-14 Ks Kolbenschmidt Gmbh Kolben für eine Brennkraftmaschine
FR2848129B1 (fr) * 2002-12-05 2006-01-27 Ascometal Sa Procede de fabrication d'un piston pour moteur a explosion, et piston ainsi obtenu
DE102005041001A1 (de) * 2005-08-29 2007-03-22 Ks Kolbenschmidt Gmbh Leichtbaukolben
JP2009228483A (ja) * 2008-03-19 2009-10-08 Toyota Motor Corp 内燃機関のピストン
DE102009018981A1 (de) * 2009-04-25 2010-10-28 Daimler Ag Kolben für eine Hubkolbenmaschine
CN201560857U (zh) * 2009-10-15 2010-08-25 重庆宗申发动机制造有限公司 一种活塞
JP5994512B2 (ja) * 2012-09-19 2016-09-21 スズキ株式会社 内燃機関用ピストン

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1568547A (en) * 1924-12-13 1926-01-05 William R Day Piston
US3173345A (en) * 1963-02-12 1965-03-16 Thompson Marion Lee Piston
US7415961B1 (en) * 2007-02-01 2008-08-26 Marina Ling Chen Piston for internal combustion engine, compressor or the like
US20090188464A1 (en) * 2008-01-29 2009-07-30 Brp-Rotax Gmbh & Co. Kg Piston for an internal combustion engine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10968862B2 (en) * 2013-11-07 2021-04-06 Tenneco Inc. Monolithic, galleryless piston and method of construction thereof

Also Published As

Publication number Publication date
CN110114570A (zh) 2019-08-09
WO2018104399A1 (fr) 2018-06-14
DE102017129037A1 (de) 2018-06-07
MX2019006061A (es) 2019-08-12
EP3551869A1 (fr) 2019-10-16

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